Licensing

KerfScript is dual licensed. You can use it under either:

The GNU Affero General Public License, version 3 only (AGPL-3.0-only, full text in LICENSE), together with the additional permission below, or
A commercial licence from MyLaserTools.

What the AGPL means for you

Free, under the AGPL, when you:

write KerfScript programs and cut, sell or share what you make with them
use the kerf command line tool, or the library inside software you only run for yourself
build open source software on KerfScript and publish its complete source code under the AGPL

You need a commercial licence when you:

ship KerfScript inside a closed source app, plugin, machine or firmware
run KerfScript (or a modified copy) behind a website or online service and do not want to publish that service's complete source code under the AGPL
want to change KerfScript without sharing your changes

The AGPL treats letting people use the software over a network like distributing it: if you modify KerfScript or build it into a service that others use, you must offer those users the complete corresponding source code of the whole program under the AGPL.

Additional permission: your designs are yours

As an additional permission under section 7 of the AGPL, MyLaserTools grants that:

KerfScript programs you write (.kerf files), including programs that use or include the KerfScript standard library in lib/, are not considered a work based on KerfScript, and you may license and sell them on any terms you choose.
Files that KerfScript produces from your programs (SVG, DXF, JSON and others) belong to you and are not covered by the AGPL.

This permission covers your programs and their output only. It does not cover the KerfScript interpreter, its tools, or modified copies of the standard library, which remain under the AGPL.

Commercial licences

A commercial licence replaces the AGPL obligations with ordinary commercial terms: closed source use, use in hosted services, private modifications and support options. Terms and pricing are set per agreement.

Contact: julia@mylasertools.com

Trademarks

"KerfScript" and the KerfScript logo are trademarks of MyLaserTools and are not licensed by the AGPL or by the commercial licence unless that licence says so. See TRADEMARKS.md.

Contributions

MyLaserTools accepts contributions under the Contributor License Agreement, which lets MyLaserTools keep offering KerfScript under both licences.

Trademark policy

"KerfScript", the .kerf file format name used as a product name, and the KerfScript logo are trademarks of MyLaserTools. The software licences (AGPL-3.0-only and commercial) cover the code. They do not grant rights to the name or logo.

This policy keeps "KerfScript" meaning one well defined language, so a .kerf file written for one KerfScript tool works in every tool that uses the name.

You may, without asking

say your design, tutorial, course, video or library is written in KerfScript or works with KerfScript
use the .kerf file extension for KerfScript programs
use the name to refer to this project and to unmodified copies of it
publish a fork for development, as long as it is clearly marked as a fork and does not use the name or logo as its own product name

You need written permission to

name a product, service, company, domain or package "KerfScript" or anything confusingly similar (for example "KerfScript Pro", "kerfscript-cloud")
call your own implementation, editor or service "KerfScript compatible" or "official". Compatibility claims require passing the KerfScript conformance tests for the language version you claim
use the logo, other than to link to this project
distribute a modified interpreter under the KerfScript name

Language specification

The language reference (LANGUAGE.md) is published under Creative Commons Attribution-NoDerivatives 4.0 (CC BY-ND 4.0). You may copy and share it unchanged with attribution. Changes to the language are made by MyLaserTools through this repository, so there is one KerfScript.

Contact

julia@mylasertools.com